Research on the Multiple-Input Single-Output Channel under Attack

The problem we consider is the security communication in MISO (Multiple-input Single-output) scenario. The scenario is connected via wireless signal between two points: the transmitter and the receiver. We assume that transmitter has multiple antennas while receiver has one. In recent papers, they assume that the useful information can be received by the indeed receiver completely but not the eavesdropper. In this paper we take the identity of active attacker to superimpose the attack signal which uses high power all-directional antennas to inject on the original signal. We do the analysis and research on the defect of MISO wireless channel with the mutual information as the mathematical description quantity. This Paper elicits and defines the concept of wireless channel information loss rate. In the end, the MISO security communication solutions against the active attack are given using null space connection technology.